MDX Query

Hai Friends,

Please help me to get result from the query

1.I need result from the cube , after who have take the first travel in bus

with Member[Measures].[FirstTravelDate]
as filter([TravelStartDate].[Date].[Date],[Measures].[TravelerCount]).Item(0).Name

Select non empty ( ([Customer].[Customer].[Customer]) on columns
,non empty ([TravelStartDate].[Date].[Date]) on rows
 from
 [BookingCube]
 where 
 ([Supplier].[SupplierType].[SupplierType].[Bus] , [Measures].[FirstTravelDate] > [TravelStartDate].[Date].[Date])

Plsease lead me how can i use sub Query to get the result

Thanks,

Thanks, Vasantha Prabakaran